Cannot find symbol class, but why not?

Newbie to Java - I created a new class called Temperature and now am trying to write a class called TempDemo to test everything - but can't get past "linking" the two programs. I think I followed the format of my other programs by:

1) Naming the first program

Java Code:

public class Temperature

2) Using the following to tell the second program to go to this class

Java Code:

Temperature t = new Temperature();

When I do this it comes back with an error "cannot find symbol class Temperature". Can't figure this out! Here is the complete code. Thanks in advance for any help you can provide. Gary

Don't I feel like an idiot! It wasn't working because I took this project to school on a flash drive and it was saving the first program to that, and since I started the second program at home it was saving it on the hard drive. Like I said, total idiot!